Serene interior of local man (4)

I believe the answer is:

calm

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'serene' is the definition.
(synonyms)

'of local man' is the wordplay.
'of' indicates a hidden word.
'CALM' can be found hidden inside 'local man'.

'interior' is the link.
This may not be right. It may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for calm that I've seen before include "Peace or stillness" , "Self-possessed" , "Pacific" , "Controlled, not agitated" , "Placid and unruffled" .)

I've seen this clue in The Daily Express.

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